aboutsummaryrefslogtreecommitdiffstats
path: root/include/sound/pcm.h
blob: bbe6eb1ff5d2290e116a08b1bff5d186240ba39d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __SOUND_PCM_H
#define __SOUND_PCM_H

/*
 *  Digital Audio (PCM) abstract layer
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *                   Abramo Bagnara <abramo@alsa-project.org>
 */

#include <sound/asound.h>
#include <sound/memalloc.h>
#include <sound/minors.h>
#include <linux/poll.h>
#include <linux/mm.h>
#include <linux/bitops.h>
#include <linux/pm_qos.h>
#include <linux/refcount.h>

#define snd_pcm_substream_chip(substream) ((substream)->private_data)
#define snd_pcm_chip(pcm) ((pcm)->private_data)

#if IS_ENABLED(CONFIG_SND_PCM_OSS)
#include <sound/pcm_oss.h>
#endif

/*
 *  Hardware (lowlevel) section
 */

struct snd_pcm_hardware {
	unsigned int info;		/* SNDRV_PCM_INFO_* */
	u64 formats;			/* SNDRV_PCM_FMTBIT_* */
	unsigned int rates;		/* SNDRV_PCM_RATE_* */
	unsigned int rate_min;		/* min rate */
	unsigned int rate_max;		/* max rate */
	unsigned int channels_min;	/* min channels */
	unsigned int channels_max;	/* max channels */
	size_t buffer_bytes_max;	/* max buffer size */
	size_t period_bytes_min;	/* min period size */
	size_t period_bytes_max;	/* max period size */
	unsigned int periods_min;	/* min # of periods */
	unsigned int periods_max;	/* max # of periods */
	size_t fifo_size;		/* fifo size in bytes */
};

struct snd_pcm_substream;

struct snd_pcm_audio_tstamp_config; /* definitions further down */
struct snd_pcm_audio_tstamp_report;

struct snd_pcm_ops {
	int (*open)(struct snd_pcm_substream *substream);
	int (*close)(struct snd_pcm_substream *substream);
	int (*ioctl)(struct snd_pcm_substream * substream,
		     unsigned int cmd, void *arg);
	int (*hw_params)(struct snd_pcm_substream *substream,
			 struct snd_pcm_hw_params *params);
	int (*hw_free)(struct snd_pcm_substream *substream);
	int (*prepare)(struct snd_pcm_substream *substream);
	int (*trigger)(struct snd_pcm_substream *substream, int cmd);
	snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
	int (*get_time_info)(struct snd_pcm_substream *substream,
			struct timespec *system_ts, struct timespec *audio_ts,
			struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
			struct snd_pcm_audio_tstamp_report *audio_tstamp_report);
	int (*fill_silence)(struct snd_pcm_substream *substream, int channel,
			    unsigned long pos, unsigned long bytes);
	int (*copy_user)(struct snd_pcm_substream *substream, int channel,
			 unsigned long pos, void __user *buf,
			 unsigned long bytes);
	int (*copy_kernel)(struct snd_pcm_substream *substream, int channel,
			   unsigned long pos, void *buf, unsigned long bytes);
	struct page *(*page)(struct snd_pcm_substream *substream,
			     unsigned long offset);
	int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
	int (*ack)(struct snd_pcm_substream *substream);
};

/*
 *
 */

#if defined(CONFIG_SND_DYNAMIC_MINORS)
#define SNDRV_PCM_DEVICES	(SNDRV_OS_MINORS-2)
#else
#define SNDRV_PCM_DEVICES	8
#endif

#define SNDRV_PCM_IOCTL1_RESET		0
/* 1 is absent slot. */
#define SNDRV_PCM_IOCTL1_CHANNEL_INFO	2
/* 3 is absent slot. */
#define SNDRV_PCM_IOCTL1_FIFO_SIZE	4

#define SNDRV_PCM_TRIGGER_STOP		0
#define SNDRV_PCM_TRIGGER_START		1
#define SNDRV_PCM_TRIGGER_PAUSE_PUSH	3
#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE	4
#define SNDRV_PCM_TRIGGER_SUSPEND	5
#define SNDRV_PCM_TRIGGER_RESUME	6
#define SNDRV_PCM_TRIGGER_DRAIN		7

#define SNDRV_PCM_POS_XRUN		((snd_pcm_uframes_t)-1)

/* If you change this don't forget to change rates[] table in pcm_native.c */
#define SNDRV_PCM_RATE_5512		(1<<0)		/* 5512Hz */
#define SNDRV_PCM_RATE_8000		(1<<1)		/* 8000Hz */
#define SNDRV_PCM_RATE_11025		(1<<2)		/* 11025Hz */
#define SNDRV_PCM_RATE_16000		(1<<3)		/* 16000Hz */
#define SNDRV_PCM_RATE_22050		(1<<4)		/* 22050Hz */
#define SNDRV_PCM_RATE_32000		(1<<5)		/* 32000Hz */
#define SNDRV_PCM_RATE_44100		(1<<6)		/* 44100Hz */
#define SNDRV_PCM_RATE_48000		(1<<7)		/* 48000Hz */
#define SNDRV_PCM_RATE_64000		(1<<8)		/* 64000Hz */
#define SNDRV_PCM_RATE_88200		(1<<9)		/* 88200Hz */
#define SNDRV_PCM_RATE_96000		(1<<10)		/* 96000Hz */
#define SNDRV_PCM_RATE_176400		(1<<11)		/* 176400Hz */
#define SNDRV_PCM_RATE_192000		(1<<12)		/* 192000Hz */
#define SNDRV_PCM_RATE_352800		(1<<13)		/* 352800Hz */
#define SNDRV_PCM_RATE_384000		(1<<14)		/* 384000Hz */

#define SNDRV_PCM_RATE_CONTINUOUS	(1<<30)		/* continuous range */
#define SNDRV_PCM_RATE_KNOT		(1<<31)		/* supports more non-continuos rates */

#define SNDRV_PCM_RATE_8000_44100	(SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
					 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
					 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
#define SNDRV_PCM_RATE_8000_48000	(SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
#define SNDRV_PCM_RATE_8000_96000	(SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
					 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
#define SNDRV_PCM_RATE_8000_192000	(SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
					 SNDRV_PCM_RATE_192000)
#define SNDRV_PCM_RATE_8000_384000	(SNDRV_PCM_RATE_8000_192000|\
					 SNDRV_PCM_RATE_352800|\
					 SNDRV_PCM_RATE_384000)
#define _SNDRV_PCM_FMTBIT(fmt)		(1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
#define SNDRV_PCM_FMTBIT_S8		_SNDRV_PCM_FMTBIT(S8)
#define SNDRV_PCM_FMTBIT_U8		_SNDRV_PCM_FMTBIT(U8)
#define SNDRV_PCM_FMTBIT_S16_LE		_SNDRV_PCM_FMTBIT(S16_LE)
#define SNDRV_PCM_FMTBIT_S16_BE		_SNDRV_PCM_FMTBIT(S16_BE)
#define SNDRV_PCM_FMTBIT_U16_LE		_SNDRV_PCM_FMTBIT(U16_LE)
#define SNDRV_PCM_FMTBIT_U16_BE		_SNDRV_PCM_FMTBIT(U16_BE)
#define SNDRV_PCM_FMTBIT_S24_LE		_SNDRV_PCM_FMTBIT(S24_LE)
#define SNDRV_PCM_FMTBIT_S24_BE		_SNDRV_PCM_FMTBIT(S24_BE)
#define SNDRV_PCM_FMTBIT_U24_LE		_SNDRV_PCM_FMTBIT(U24_LE)
#define SNDRV_PCM_FMTBIT_U24_BE		_SNDRV_PCM_FMTBIT(U24_BE)
#define SNDRV_PCM_FMTBIT_S32_LE		_SNDRV_PCM_FMTBIT(S32_LE)
#define SNDRV_PCM_FMTBIT_S32_BE		_SNDRV_PCM_FMTBIT(S32_BE)
#define SNDRV_PCM_FMTBIT_U32_LE		_SNDRV_PCM_FMTBIT(U32_LE)
#define SNDRV_PCM_FMTBIT_U32_BE		_SNDRV_PCM_FMTBIT(U32_BE)
#define SNDRV_PCM_FMTBIT_FLOAT_LE	_SNDRV_PCM_FMTBIT(FLOAT_LE)
#define SNDRV_PCM_FMTBIT_FLOAT_BE	_SNDRV_PCM_FMTBIT(FLOAT_BE)
#define SNDRV_PCM_FMTBIT_FLOAT64_LE	_SNDRV_PCM_FMTBIT(FLOAT64_LE)
#define SNDRV_PCM_FMTBIT_FLOAT64_BE	_SNDRV_PCM_FMTBIT(FLOAT64_BE)
#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
#define SNDRV_PCM_FMTBIT_MU_LAW		_SNDRV_PCM_FMTBIT(MU_LAW)
#define SNDRV_PCM_FMTBIT_A_LAW		_SNDRV_PCM_FMTBIT(A_LAW)
#define SNDRV_PCM_FMTBIT_IMA_ADPCM	_SNDRV_PCM_FMTBIT(IMA_ADPCM)
#define SNDRV_PCM_FMTBIT_MPEG		_SNDRV_PCM_FMTBIT(MPEG)
#define SNDRV_PCM_FMTBIT_GSM		_SNDRV_PCM_FMTBIT(GSM)
#define SNDRV_PCM_FMTBIT_S20_LE	_SNDRV_PCM_FMTBIT(S20_LE)
#define SNDRV_PCM_FMTBIT_U20_LE	_SNDRV_PCM_FMTBIT(U20_LE)
#define SNDRV_PCM_FMTBIT_S20_BE	_SNDRV_PCM_FMTBIT(S20_BE)
#define SNDRV_PCM_FMTBIT_U20_BE	_SNDRV_PCM_FMTBIT(U20_BE)
#define SNDRV_PCM_FMTBIT_SPECIAL	_SNDRV_PCM_FMTBIT(SPECIAL)
#define SNDRV_PCM_FMTBIT_S24_3LE	_SNDRV_PCM_FMTBIT(S24_3LE)
#define SNDRV_PCM_FMTBIT_U24_3LE	_SNDRV_PCM_FMTBIT(U24_3LE)
#define SNDRV_PCM_FMTBIT_S24_3BE	_SNDRV_PCM_FMTBIT(S24_3BE)
#define SNDRV_PCM_FMTBIT_U24_3BE	_SNDRV_PCM_FMTBIT(U24_3BE)
#define SNDRV_PCM_FMTBIT_S20_3LE	_SNDRV_PCM_FMTBIT(S20_3LE)
#define SNDRV_PCM_FMTBIT_U20_3LE	_SNDRV_PCM_FMTBIT(U20_3LE)
#define SNDRV_PCM_FMTBIT_S20_3BE	_SNDRV_PCM_FMTBIT(S20_3BE)
#define SNDRV_PCM_FMTBIT_U20_3BE	_SNDRV_PCM_FMTBIT(U20_3BE)
#define SNDRV_PCM_FMTBIT_S18_3LE	_SNDRV_PCM_FMTBIT(S18_3LE)
#define SNDRV_PCM_FMTBIT_U18_3LE	_SNDRV_PCM_FMTBIT(U18_3LE)
#define SNDRV_PCM_FMTBIT_S18_3BE	_SNDRV_PCM_FMTBIT(S18_3BE)
#define SNDRV_PCM_FMTBIT_U18_3BE	_SNDRV_PCM_FMTBIT(U18_3BE)
#define SNDRV_PCM_FMTBIT_G723_24	_SNDRV_PCM_FMTBIT(G723_24)
#define SNDRV_PCM_FMTBIT_G723_24_1B	_SNDRV_PCM_FMTBIT(G723_24_1B)
#define SNDRV_PCM_FMTBIT_G723_40	_SNDRV_PCM_FMTBIT(G723_40)
#define SNDRV_PCM_FMTBIT_G723_40_1B	_SNDRV_PCM_FMTBIT(G723_40_1B)
#define SNDRV_PCM_FMTBIT_DSD_U8		_SNDRV_PCM_FMTBIT(DSD_U8)
#define SNDRV_PCM_FMTBIT_DSD_U16_LE	_SNDRV_PCM_FMTBIT(DSD_U16_LE)
#define SNDRV_PCM_FMTBIT_DSD_U32_LE	_SNDRV_PCM_FMTBIT(DSD_U32_LE)
#define SNDRV_PCM_FMTBIT_DSD_U16_BE	_SNDRV_PCM_FMTBIT(DSD_U16_BE)
#define SNDRV_PCM_FMTBIT_DSD_U32_BE	_SNDRV_PCM_FMTBIT(DSD_U32_BE)

#ifdef SNDRV_LITTLE_ENDIAN
#define SNDRV_PCM_FMTBIT_S16		SNDRV_PCM_FMTBIT_S16_LE
#define SNDRV_PCM_FMTBIT_U16		SNDRV_PCM_FMTBIT_U16_LE
#define SNDRV_PCM_FMTBIT_S24		SNDRV_PCM_FMTBIT_S24_LE
#define SNDRV_PCM_FMTBIT_U24		SNDRV_PCM_FMTBIT_U24_LE
#define SNDRV_PCM_FMTBIT_S32		SNDRV_PCM_FMTBIT_S32_LE
#define SNDRV_PCM_FMTBIT_U32		SNDRV_PCM_FMTBIT_U32_LE
#define SNDRV_PCM_FMTBIT_FLOAT		SNDRV_PCM_FMTBIT_FLOAT_LE
#define SNDRV_PCM_FMTBIT_FLOAT64	SNDRV_PCM_FMTBIT_FLOAT64_LE
#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
#define SNDRV_PCM_FMTBIT_S20		SNDRV_PCM_FMTBIT_S20_LE
#define SNDRV_PCM_FMTBIT_U20		SNDRV_PCM_FMTBIT_U20_LE
#endif
#ifdef SNDRV_BIG_ENDIAN
#define SNDRV_PCM_FMTBIT_S16		SNDRV_PCM_FMTBIT_S16_BE
#define SNDRV_PCM_FMTBIT_U16		SNDRV_PCM_FMTBIT_U16_BE
#define SNDRV_PCM_FMTBIT_S24		SNDRV_PCM_FMTBIT_S24_BE
#define SNDRV_PCM_FMTBIT_U24		SNDRV_PCM_FMTBIT_U24_BE
#define SNDRV_PCM_FMTBIT_S32		SNDRV_PCM_FMTBIT_S32_BE
#define SNDRV_PCM_FMTBIT_U32		SNDRV_PCM_FMTBIT_U32_BE
#define SNDRV_PCM_FMTBIT_FLOAT		SNDRV_PCM_FMTBIT_FLOAT_BE
#define SNDRV_PCM_FMTBIT_FLOAT64	SNDRV_PCM_FMTBIT_FLOAT64_BE
#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
#define SNDRV_PCM_FMTBIT_S20		SNDRV_PCM_FMTBIT_S20_BE
#define SNDRV_PCM_FMTBIT_U20		SNDRV_PCM_FMTBIT_U20_BE
#endif

struct snd_pcm_file {
	struct snd_pcm_substream *substream;
	int no_compat_mmap;
	unsigned int user_pversion;	/* supported protocol version */
};

struct snd_pcm_hw_rule;
typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
				      struct snd_pcm_hw_rule *rule);

struct snd_pcm_hw_rule {
	unsigned int cond;
	int var;
	int deps[4];

	snd_pcm_hw_rule_func_t func;
	void *private;
};

struct snd_pcm_hw_constraints {
	struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 
			 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
	struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
			     SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
	unsigned int rules_num;
	unsigned int rules_all;
	struct snd_pcm_hw_rule *rules;
};

static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
					    snd_pcm_hw_param_t var)
{
	return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
}

static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
						    snd_pcm_hw_param_t var)
{
	return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
}

struct snd_ratnum {
	unsigned int num;
	unsigned int den_min, den_max, den_step;
};

struct snd_ratden {
	unsigned int num_min, num_max, num_step;
	unsigned int den;
};

struct snd_pcm_hw_constraint_ratnums {
	int nrats;
	const struct snd_ratnum *rats;
};

struct snd_pcm_hw_constraint_ratdens {
	int nrats;
	const struct snd_ratden *rats;
};

struct snd_pcm_hw_constraint_list {
	const unsigned int *list;
	unsigned int count;
	unsigned int mask;
};

struct snd_pcm_hw_constraint_ranges {
	unsigned int count;
	const struct snd_interval *ranges;
	unsigned int mask;
};

/*
 * userspace-provided audio timestamp config to kernel,
 * structure is for internal use only and filled with dedicated unpack routine
 */
struct snd_pcm_audio_tstamp_config {
	/* 5 of max 16 bits used */
	u32 type_requested:4;
	u32 report_delay:1; /* add total delay to A/D or D/A */
};

static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
						struct snd_pcm_audio_tstamp_config *config)
{
	config->type_requested = data & 0xF;
	config->report_delay = (data >> 4) & 1;
}

/*
 * kernel-provided audio timestamp report to user-space
 * structure is for internal use only and read by dedicated pack routine
 */
struct snd_pcm_audio_tstamp_report {
	/* 6 of max 16 bits used for bit-fields */

	/* for backwards compatibility */
	u32 valid:1;

	/* actual type if hardware could not support requested timestamp */
	u32 actual_type:4;

	/* accuracy represented in ns units */
	u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
	u32 accuracy; /* up to 4.29s, will be packed in separate field  */
};

static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
						const struct snd_pcm_audio_tstamp_report *report)
{
	u32 tmp;

	tmp = report->accuracy_report;
	tmp <<= 4;
	tmp |= report->actual_type;
	tmp <<= 1;
	tmp |= report->valid;

	*data &= 0xffff; /* zero-clear MSBs */
	*data |= (tmp << 16);
	*accuracy = report->accuracy;
}


struct snd_pcm_runtime {
	/* -- Status -- */
	struct snd_pcm_substream *trigger_master;
	struct timespec trigger_tstamp;	/* trigger timestamp */
	bool trigger_tstamp_latched;     /* trigger timestamp latched in low-level driver/hardware */
	int overrange;
	snd_pcm_uframes_t avail_max;
	snd_pcm_uframes_t hw_ptr_base;	/* Position at buffer restart */
	snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
	unsigned long hw_ptr_jiffies;	/* Time when hw_ptr is updated */
	unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
	snd_pcm_sframes_t delay;	/* extra delay; typically FIFO size */
	u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */

	/* -- HW params -- */
	snd_pcm_access_t access;	/* access mode */
	snd_pcm_format_t format;	/* SNDRV_PCM_FORMAT_* */
	snd_pcm_subformat_t subformat;	/* subformat */
	unsigned int rate;		/* rate in Hz */
	unsigned int channels;		/* channels */
	snd_pcm_uframes_t period_size;	/* period size */
	unsigned int periods;		/* periods */
	snd_pcm_uframes_t buffer_size;	/* buffer size */
	snd_pcm_uframes_t min_align;	/* Min alignment for the format */
	size_t byte_align;
	unsigned int frame_bits;
	unsigned int sample_bits;
	unsigned int info;
	unsigned int rate_num;
	unsigned int rate_den;
	unsigned int no_period_wakeup: 1;

	/* -- SW params -- */
	int tstamp_mode;		/* mmap timestamp is updated */
  	unsigned int period_step;
	snd_pcm_uframes_t start_threshold;
	snd_pcm_uframes_t stop_threshold;
	snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
						noise is nearest than this */
	snd_pcm_uframes_t silence_size;	/* Silence filling size */
	snd_pcm_uframes_t boundary;	/* pointers wrap point */

	snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
	snd_pcm_uframes_t silence_filled; /* size filled with silence */

	union snd_pcm_sync_id sync;	/* hardware synchronization ID */

	/* -- mmap -- */
	struct snd_pcm_mmap_status *status;
	struct snd_pcm_mmap_control *control;

	/* -- locking / scheduling -- */
	snd_pcm_uframes_t twake; 	/* do transfer (!poll) wakeup if non-zero */
	wait_queue_head_t sleep;	/* poll sleep */
	wait_queue_head_t tsleep;	/* transfer sleep */
	struct fasync_struct *fasync;

	/* -- private section -- */
	void *private_data;
	void (*private_free)(struct snd_pcm_runtime *runtime);

	/* -- hardware description -- */
	struct snd_pcm_hardware hw;
	struct snd_pcm_hw_constraints hw_constraints;

	/* -- timer -- */
	unsigned int timer_resolution;	/* timer resolution */
	int tstamp_type;		/* timestamp type */

	/* -- DMA -- */           
	unsigned char *dma_area;	/* DMA area */
	dma_addr_t dma_addr;		/* physical bus address (not accessible from main CPU) */
	size_t dma_bytes;		/* size of DMA area */

	struct snd_dma_buffer *dma_buffer_p;	/* allocated buffer */

	/* -- audio timestamp config -- */
	struct snd_pcm_audio_tstamp_config audio_tstamp_config;
	struct snd_pcm_audio_tstamp_report audio_tstamp_report;
	struct timespec driver_tstamp;

#if IS_ENABLED(CONFIG_SND_PCM_OSS)
	/* -- OSS things -- */
	struct snd_pcm_oss_runtime oss;
#endif
};

struct snd_pcm_group {		/* keep linked substreams */
	spinlock_t lock;
	struct mutex mutex;
	struct list_head substreams;
	refcount_t refs;
};

struct pid;

struct snd_pcm_substream {
	struct snd_pcm *pcm;
	struct snd_pcm_str *pstr;
	void *private_data;		/* copied from pcm->private_data */
	int number;
	char name[32];			/* substream name */
	int stream;			/* stream (direction) */
	struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
	size_t buffer_bytes_max;	/* limit ring buffer size */
	struct snd_dma_buffer dma_buffer;
	size_t dma_max;
	/* -- hardware operations -- */
	const struct snd_pcm_ops *ops;
	/* -- runtime information -- */
	struct snd_pcm_runtime *runtime;
        /* -- timer section -- */
	struct snd_timer *timer;		/* timer */
	unsigned timer_running: 1;	/* time is running */
	long wait_time;	/* time in ms for R/W to wait for avail */
	/* -- next substream -- */
	struct snd_pcm_substream *next;
	/* -- linked substreams -- */
	struct list_head link_list;	/* linked list member */
	struct snd_pcm_group self_group;	/* fake group for non linked substream (with substream lock inside) */
	struct snd_pcm_group *group;		/* pointer to current group */
	/* -- assigned files -- */
	int ref_count;
	atomic_t mmap_count;
	unsigned int f_flags;
	void (*pcm_release)(struct snd_pcm_substream *);
	struct pid *pid;
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
	/* -- OSS things -- */
	struct snd_pcm_oss_substream oss;
#endif
#ifdef CONFIG_SND_VERBOSE_PROCFS
	struct snd_info_entry *proc_root;
#endif /* CONFIG_SND_VERBOSE_PROCFS */
	/* misc flags */
	unsigned int hw_opened: 1;
};

#define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)


struct snd_pcm_str {
	int stream;				/* stream (direction) */
	struct snd_pcm *pcm;
	/* -- substreams -- */
	unsigned int substream_count;
	unsigned int substream_opened;
	struct snd_pcm_substream *substream;
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
	/* -- OSS things -- */
	struct snd_pcm_oss_stream oss;
#endif
#ifdef CONFIG_SND_VERBOSE_PROCFS
	struct snd_info_entry *proc_root;
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
	unsigned int xrun_debug;	/* 0 = disabled, 1 = verbose, 2 = stacktrace */
#endif
#endif
	struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
	struct device dev;
};

struct snd_pcm {
	struct snd_card *card;
	struct list_head list;
	int device; /* device number */
	unsigned int info_flags;
	unsigned short dev_class;
	unsigned short dev_subclass;
	char id[64];
	char name[80];
	struct snd_pcm_str streams[2];
	struct mutex open_mutex;
	wait_queue_head_t open_wait;
	void *private_data;
	void (*private_free) (struct snd_pcm *pcm);
	bool internal; /* pcm is for internal use only */
	bool nonatomic; /* whole PCM operations are in non-atomic context */
	bool no_device_suspend; /* don't invoke device PM suspend */
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
	struct snd_pcm_oss oss;
#endif
};

/*
 *  Registering
 */

extern const struct file_operations snd_pcm_f_ops[2];

int snd_pcm_new(struct snd_card *card, const char *id, int device,
		int playback_count, int capture_count,
		struct snd_pcm **rpcm);
int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
		int playback_count, int capture_count,
		struct snd_pcm **rpcm);
int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);

#if IS_ENABLED(CONFIG_SND_PCM_OSS)
struct snd_pcm_notify {
	int (*n_register) (struct snd_pcm * pcm);
	int (*n_disconnect) (struct snd_pcm * pcm);
	int (*n_unregister) (struct snd_pcm * pcm);
	struct list_head list;
};
int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
#endif

/*
 *  Native I/O
 */

int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
int snd_pcm_info_user(struct snd_pcm_substream *substream,
		      struct snd_pcm_info __user *info);
int snd_pcm_status(struct snd_pcm_substream *substream,
		   struct snd_pcm_status *status);
int snd_pcm_start(struct snd_pcm_substream *substream);
int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
int snd_pcm_drain_done(struct snd_pcm_substream *substream);
int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
#ifdef CONFIG_PM
int snd_pcm_suspend_all(struct snd_pcm *pcm);
#else
static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
{
	return 0;
}
#endif
int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
			   struct snd_pcm_substream **rsubstream);
void snd_pcm_release_substream(struct snd_pcm_substream *substream);
int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
			     struct snd_pcm_substream **rsubstream);
void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);


#ifdef CONFIG_SND_DEBUG
void snd_pcm_debug_name(struct snd_pcm_substream *substream,
			   char *name, size_t len);
#else
static inline void
snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
{
	*buf = 0;
}
#endif

/*
 *  PCM library
 */

/**
 * snd_pcm_stream_linked - Check whether the substream is linked with others
 * @substream: substream to check
 *
 * Returns true if the given substream is being linked with others.
 */
static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
{
	return substream->group != &substream->self_group;
}

void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);

/**
 * snd_pcm_stream_lock_irqsave - Lock the PCM stream
 * @substream: PCM substream
 * @flags: irq flags
 *
 * This locks the PCM stream like snd_pcm_stream_lock() but with the local
 * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 * as snd_pcm_stream_lock().
 */
#define snd_pcm_stream_lock_irqsave(substream, flags)		 \
	do {							 \
		typecheck(unsigned long, flags);		 \
		flags = _snd_pcm_stream_lock_irqsave(substream); \
	} while (0)
void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
				      unsigned long flags);

/**
 * snd_pcm_group_for_each_entry - iterate over the linked substreams
 * @s: the iterator
 * @substream: the substream
 *
 * Iterate over the all linked substreams to the given @substream.
 * When @substream isn't linked with any others, this gives returns @substream
 * itself once.
 */
#define snd_pcm_group_for_each_entry(s, substream) \
	list_for_each_entry(s, &substream->group->substreams, link_list)

/**
 * snd_pcm_running - Check whether the substream is in a running state
 * @substream: substream to check
 *
 * Returns true if the given substream is in the state RUNNING, or in the
 * state DRAINING for playback.
 */
static inline int snd_pcm_running(struct snd_pcm_substream *substream)
{
	return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
		(substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
		 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
}

/**
 * bytes_to_samples - Unit conversion of the size from bytes to samples
 * @runtime: PCM runtime instance
 * @size: size in bytes
 */
static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
{
	return size * 8 / runtime->sample_bits;
}

/**
 * bytes_to_frames - Unit conversion of the size from bytes to frames
 * @runtime: PCM runtime instance
 * @size: size in bytes
 */
static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
{
	return size * 8 / runtime->frame_bits;
}

/**
 * samples_to_bytes - Unit conversion of the size from samples to bytes
 * @runtime: PCM runtime instance
 * @size: size in samples
 */
static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
{
	return size * runtime->sample_bits / 8;
}

/**
 * frames_to_bytes - Unit conversion of the size from frames to bytes
 * @runtime: PCM runtime instance
 * @size: size in frames
 */
static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
{
	return size * runtime->frame_bits / 8;
}

/**
 * frame_aligned - Check whether the byte size is aligned to frames
 * @runtime: PCM runtime instance
 * @bytes: size in bytes
 */
static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
{
	return bytes % runtime->byte_align == 0;
}

/**
 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
 * @substream: PCM substream
 */
static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	return frames_to_bytes(runtime, runtime->buffer_size);
}

/**
 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
 * @substream: PCM substream
 */
static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	return frames_to_bytes(runtime, runtime->period_size);
}

/**
 * snd_pcm_playback_avail - Get the available (writable) space for playback
 * @runtime: PCM runtime instance
 *
 * Result is between 0 ... (boundary - 1)
 */
static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
{
	snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
	if (avail < 0)
		avail += runtime->boundary;
	else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
		avail -= runtime->boundary;
	return avail;
}

/**
 * snd_pcm_capture_avail - Get the available (readable) space for capture
 * @runtime: PCM runtime instance
 *
 * Result is between 0 ... (boundary - 1)
 */
static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
{
	snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
	if (avail < 0)
		avail += runtime->boundary;
	return avail;
}

/**
 * snd_pcm_playback_hw_avail - Get the queued space for playback
 * @runtime: PCM runtime instance
 */
static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
{
	return runtime->buffer_size - snd_pcm_playback_avail(runtime);
}

/**
 * snd_pcm_capture_hw_avail - Get the free space for capture
 * @runtime: PCM runtime instance
 */
static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
{
	return runtime->buffer_size - snd_pcm_capture_avail(runtime);
}

/**
 * snd_pcm_playback_ready - check whether the playback buffer is available
 * @substream: the pcm substream instance
 *
 * Checks whether enough free space is available on the playback buffer.
 *
 * Return: Non-zero if available, or zero if not.
 */
static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
}

/**
 * snd_pcm_capture_ready - check whether the capture buffer is available
 * @substream: the pcm substream instance
 *
 * Checks whether enough capture data is available on the capture buffer.
 *
 * Return: Non-zero if available, or zero if not.
 */
static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
}

/**
 * snd_pcm_playback_data - check whether any data exists on the playback buffer
 * @substream: the pcm substream instance
 *
 * Checks whether any data exists on the playback buffer.
 *
 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
 * is bigger or equal to boundary, then this function returns always non-zero.
 */
static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	
	if (runtime->stop_threshold >= runtime->boundary)
		return 1;
	return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
}

/**
 * snd_pcm_playback_empty - check whether the playback buffer is empty
 * @substream: the pcm substream instance
 *
 * Checks whether the playback buffer is empty.
 *
 * Return: Non-zero if empty, or zero if not.
 */
static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
}

/**
 * snd_pcm_capture_empty - check whether the capture buffer is empty
 * @substream: the pcm substream instance
 *
 * Checks whether the capture buffer is empty.
 *
 * Return: Non-zero if empty, or zero if not.
 */
static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	return snd_pcm_capture_avail(runtime) == 0;
}

/**
 * snd_pcm_trigger_done - Mark the master substream
 * @substream: the pcm substream instance
 * @master: the linked master substream
 *
 * When multiple substreams of the same card are linked and the hardware
 * supports the single-shot operation, the driver calls this in the loop
 * in snd_pcm_group_for_each_entry() for marking the substream as "done".
 * Then most of trigger operations are performed only to the given master
 * substream.
 *
 * The trigger_master mark is cleared at timestamp updates at the end
 * of trigger operations.
 */
static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
					struct snd_pcm_substream *master)
{
	substream->runtime->trigger_master = master;
}

static inline int hw_is_mask(int var)
{
	return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
		var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
}

static inline int hw_is_interval(int var)
{
	return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
		var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
}

static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
				     snd_pcm_hw_param_t var)
{
	return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
}

static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
					     snd_pcm_hw_param_t var)
{
	return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
}

static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
					     snd_pcm_hw_param_t var)
{
	return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
}

static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
						     snd_pcm_hw_param_t var)
{
	return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
}

/**
 * params_channels - Get the number of channels from the hw params
 * @p: hw params
 */
static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
{
	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
}

/**
 * params_rate - Get the sample rate from the hw params
 * @p: hw params
 */
static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
{
	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
}

/**
 * params_period_size - Get the period size (in frames) from the hw params
 * @p: hw params
 */
static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
{
	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
}

/**
 * params_periods - Get the number of periods from the hw params
 * @p: hw params
 */
static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
{
	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
}

/**
 * params_buffer_size - Get the buffer size (in frames) from the hw params
 * @p: hw params
 */
static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
{
	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
}

/**
 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
 * @p: hw params
 */
static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
{
	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
}

int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
int snd_interval_list(struct snd_interval *i, unsigned int count,
		      const unsigned int *list, unsigned int mask);
int snd_interval_ranges(struct snd_interval *i, unsigned int count,
			const struct snd_interval *list, unsigned int mask);
int snd_interval_ratnum(struct snd_interval *i,
			unsigned int rats_count, const struct snd_ratnum *rats,
			unsigned int *nump, unsigned int *denp);

void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);

int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);

int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
				 u_int64_t mask);
int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
				 unsigned int min, unsigned int max);
int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
			       unsigned int cond,
			       snd_pcm_hw_param_t var,
			       const struct snd_pcm_hw_constraint_list *l);
int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
				 unsigned int cond,
				 snd_pcm_hw_param_t var,
				 const struct snd_pcm_hw_constraint_ranges *r);
int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
				  unsigned int cond,
				  snd_pcm_hw_param_t var,
				  const struct snd_pcm_hw_constraint_ratnums *r);
int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
				  unsigned int cond,
				  snd_pcm_hw_param_t var,
				  const struct snd_pcm_hw_constraint_ratdens *r);
int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
				 unsigned int cond,
				 unsigned int width,
				 unsigned int msbits);
int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
			       unsigned int cond,
			       snd_pcm_hw_param_t var,
			       unsigned long step);
int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
			       unsigned int cond,
			       snd_pcm_hw_param_t var);
int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
			       unsigned int base_rate);
int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
			unsigned int cond,
			int var,
			snd_pcm_hw_rule_func_t func, void *private,
			int dep, ...);

/**
 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
 * @runtime: PCM runtime instance
 * @var: The hw_params variable to constrain
 * @val: The value to constrain to
 *
 * Return: Positive if the value is changed, zero if it's not changed, or a
 * negative error code.
 */
static inline int snd_pcm_hw_constraint_single(
	struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
	unsigned int val)
{
	return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
}

int snd_pcm_format_signed(snd_pcm_format_t format);
int snd_pcm_format_unsigned(snd_pcm_format_t format);
int snd_pcm_format_linear(snd_pcm_format_t format);
int snd_pcm_format_little_endian(snd_pcm_format_t format);
int snd_pcm_format_big_endian(snd_pcm_format_t format);
#if 0 /* just for kernel-doc */
/**
 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 * @format: the format to check
 *
 * Return: 1 if the given PCM format is CPU-endian, 0 if
 * opposite, or a negative error code if endian not specified.
 */
int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
#endif /* DocBook */
#ifdef SNDRV_LITTLE_ENDIAN
#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
#else
#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
#endif
int snd_pcm_format_width(snd_pcm_format_t format);			/* in bits */
int snd_pcm_format_physical_width(snd_pcm_format_t format);		/* in bits */
ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);

void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
		     const struct snd_pcm_ops *ops);
void snd_pcm_set_sync(struct snd_pcm_substream *substream);
int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
		      unsigned int cmd, void *arg);                      
void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
				     void *buf, bool interleaved,
				     snd_pcm_uframes_t frames, bool in_kernel);

static inline snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream *substream,
		  const void __user *buf, snd_pcm_uframes_t frames)
{
	return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
}

static inline snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream *substream,
		 void __user *buf, snd_pcm_uframes_t frames)
{
	return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
}

static inline snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream *substream,
		   void __user **bufs, snd_pcm_uframes_t frames)
{
	return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
}

static inline snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream *substream,
		  void __user **bufs, snd_pcm_uframes_t frames)
{
	return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
}

static inline snd_pcm_sframes_t
snd_pcm_kernel_write(struct snd_pcm_substream *substream,
		     const void *buf, snd_pcm_uframes_t frames)
{
	return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true);
}

static inline snd_pcm_sframes_t
snd_pcm_kernel_read(struct snd_pcm_substream *substream,
		    void *buf, snd_pcm_uframes_t frames)
{
	return __snd_pcm_lib_xfer(substream, buf, true, frames, true);
}

static inline snd_pcm_sframes_t
snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
		      void **bufs, snd_pcm_uframes_t frames)
{
	return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
}

static inline snd_pcm_sframes_t
snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
		     void **bufs, snd_pcm_uframes_t frames)
{
	return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
}

int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
					 unsigned int rates_b);
unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
					unsigned int rate_max);

/**
 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
 * @substream: PCM substream to set
 * @bufp: the buffer information, NULL to clear
 *
 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
 * Otherwise it clears the current buffer information.
 */
static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
					      struct snd_dma_buffer *bufp)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	if (bufp) {
		runtime->dma_buffer_p = bufp;
		runtime->dma_area = bufp->area;
		runtime->dma_addr = bufp->addr;
		runtime->dma_bytes = bufp->bytes;
	} else {
		runtime->dma_buffer_p = NULL;
		runtime->dma_area = NULL;
		runtime->dma_addr = 0;
		runtime->dma_bytes = 0;
	}
}

/**
 * snd_pcm_gettime - Fill the timespec depending on the timestamp mode
 * @runtime: PCM runtime instance
 * @tv: timespec to fill
 */
static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
				   struct timespec *tv)
{
	switch (runtime->tstamp_type) {
	case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
		ktime_get_ts(tv);
		break;
	case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
		getrawmonotonic(tv);
		break;
	default:
		getnstimeofday(tv);
		break;
	}
}

/*
 *  Memory
 */

void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
				  int type, struct device *data,
				  size_t size, size_t max);
void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
					  int type, void *data,
					  size_t size, size_t max);
int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);

int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
				      size_t size, gfp_t gfp_flags);
int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
					  unsigned long offset);
/**
 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
 * @substream: the substream to allocate the buffer to
 * @size: the requested buffer size, in bytes
 *
 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
 * contiguous in kernel virtual space, but not in physical memory.  Use this
 * if the buffer is accessed by kernel code but not by device DMA.
 *
 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
 * code.
 */
static inline int snd_pcm_lib_alloc_vmalloc_buffer
			(struct snd_pcm_substream *substream, size_t size)
{
	return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
						 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
}

/**
 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
 * @substream: the substream to allocate the buffer to
 * @size: the requested buffer size, in bytes
 *
 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
 *
 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
 * code.
 */
static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
			(struct snd_pcm_substream *substream, size_t size)
{
	return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
						 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
}

#define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)

#ifdef CONFIG_SND_DMA_SGBUF
/*
 * SG-buffer handling
 */
#define snd_pcm_substream_sgbuf(substream) \
	snd_pcm_get_dma_buf(substream)->private_data

struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
				    unsigned long offset);
#else /* !SND_DMA_SGBUF */
/*
 * fake using a continuous buffer
 */
#define snd_pcm_sgbuf_ops_page	NULL
#endif /* SND_DMA_SGBUF */

/**
 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
 * @substream: PCM substream
 * @ofs: byte offset
 */
static inline dma_addr_t
snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
{
	return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
}

/**
 * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset
 * @substream: PCM substream
 * @ofs: byte offset
 */
static inline void *
snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
{
	return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
}

/**
 * snd_pcm_sgbuf_chunk_size - Compute the max size that fits within the contig.
 * page from the given size
 * @substream: PCM substream
 * @ofs: byte offset
 * @size: byte size to examine
 */
static inline unsigned int
snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
			     unsigned int ofs, unsigned int size)
{
	return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
}

/**
 * snd_pcm_mmap_data_open - increase the mmap counter
 * @area: VMA
 *
 * PCM mmap callback should handle this counter properly
 */
static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
{
	struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
	atomic_inc(&substream->mmap_count);
}

/**
 * snd_pcm_mmap_data_close - decrease the mmap counter
 * @area: VMA
 *
 * PCM mmap callback should handle this counter properly
 */
static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
{
	struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
	atomic_dec(&substream->mmap_count);
}

int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
			     struct vm_area_struct *area);
/* mmap for io-memory area */
#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
#define SNDRV_PCM_INFO_MMAP_IOMEM	SNDRV_PCM_INFO_MMAP
int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
#else
#define SNDRV_PCM_INFO_MMAP_IOMEM	0
#define snd_pcm_lib_mmap_iomem	NULL
#endif

/**
 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
 * @dma: DMA number
 * @max: pointer to store the max size
 */
static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
{
	*max = dma < 4 ? 64 * 1024 : 128 * 1024;
}

/*
 *  Misc
 */

#define SNDRV_PCM_DEFAULT_CON_SPDIF	(IEC958_AES0_CON_EMPHASIS_NONE|\
					 (IEC958_AES1_CON_ORIGINAL<<8)|\
					 (IEC958_AES1_CON_PCM_CODER<<8)|\
					 (IEC958_AES3_CON_FS_48000<<24))

#define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)

const char *snd_pcm_format_name(snd_pcm_format_t format);

/**
 * snd_pcm_stream_str - Get a string naming the direction of a stream
 * @substream: the pcm substream instance
 *
 * Return: A string naming the direction of the stream.
 */
static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
{
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		return "Playback";
	else
		return "Capture";
}

/*
 * PCM channel-mapping control API
 */
/* array element of channel maps */
struct snd_pcm_chmap_elem {
	unsigned char channels;
	unsigned char map[15];
};

/* channel map information; retrieved via snd_kcontrol_chip() */
struct snd_pcm_chmap {
	struct snd_pcm *pcm;	/* assigned PCM instance */
	int stream;		/* PLAYBACK or CAPTURE */
	struct snd_kcontrol *kctl;
	const struct snd_pcm_chmap_elem *chmap;
	unsigned int max_channels;
	unsigned int channel_mask;	/* optional: active channels bitmask */
	void *private_data;	/* optional: private data pointer */
};

/**
 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
 * @info: chmap information
 * @idx: the substream number index
 */
static inline struct snd_pcm_substream *
snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
{
	struct snd_pcm_substream *s;
	for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
		if (s->number == idx)
			return s;
	return NULL;
}

/* ALSA-standard channel maps (RL/RR prior to C/LFE) */
extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
/* Other world's standard channel maps (C/LFE prior to RL/RR) */
extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];

/* bit masks to be passed to snd_pcm_chmap.channel_mask field */
#define SND_PCM_CHMAP_MASK_24	((1U << 2) | (1U << 4))
#define SND_PCM_CHMAP_MASK_246	(SND_PCM_CHMAP_MASK_24 | (1U << 6))
#define SND_PCM_CHMAP_MASK_2468	(SND_PCM_CHMAP_MASK_246 | (1U << 8))

int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
			   const struct snd_pcm_chmap_elem *chmap,
			   int max_channels,
			   unsigned long private_value,
			   struct snd_pcm_chmap **info_ret);

/**
 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
 * @pcm_format: PCM format
 */
static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
{
	return 1ULL << (__force int) pcm_format;
}

/* printk helpers */
#define pcm_err(pcm, fmt, args...) \
	dev_err((pcm)->card->dev, fmt, ##args)
#define pcm_warn(pcm, fmt, args...) \
	dev_warn((pcm)->card->dev, fmt, ##args)
#define pcm_dbg(pcm, fmt, args...) \
	dev_dbg((pcm)->card->dev, fmt, ##args)

#endif /* __SOUND_PCM_H */